package main

import "fmt"

func swap(x, y string) (string, string) {
	return y, x
}

func split(sum int) (x, y, z int) {
	x = sum * 4 / 9
	y = sum - x
	return
}

type Vertex struct {
	X int
	Y int
}

func main() {
	fmt.Println(Vertex{1, 2})
	v := Vertex{1, 2}
	v.X = 4
	fmt.Println(v.X)
}
